Reason why I give up on finding a great guy

On June 12 I had sex with a guy that I had been talking to for a long time we're not dating bc he doesn't want to be in a relationship and I was fine with that so I was away for a whole week on vacation we messaged alittle while I was there everything was fine now he's completely ignoring me he can look at my snapchat but can't reply to my message this is a grow ass man you would thing he would act his age . I was a virgin when I slept with him he's the only guy I trusted  I don't regret it but i hate myself now bc it just makes me feel like I'll never be good enough  he's 27 and I'm 21   Im just done